US Bridges

Nolan Street over Ralston Creek

Fair

Jefferson County, Colorado · 0.06 MI N of 58th Avenue · Structure no. ARVA-NN-0.06-01

Built
1950
75 years old
Condition
Fair
inspected April 2023
Type
Culvert
Steel
Length
24 ft
2 main spans
Daily traffic
576
2021 count
Owner
City
City or Municipal Highway Agency

About this bridge

Nolan Street over Ralston Creek is a steel culvert carrying Nolan Street over Ralston Creek in Jefferson County, Colorado. It was built in 1950, so it is 75 years old, older than the Colorado average of 42.2 years.

The most recent inspection reported to the Federal Highway Administration rates it in fair condition with a lowest component rating of 6 out of 9. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

It carries about 576 vehicles a day, roughly 2% of them trucks, projected to reach 662 by 2041. The structure is 24 ft (7.3 m) long and 59 ft wide. If it were closed, the detour would be 98.8 mi (159 km).

Location

Open in Google Maps
CarriesNolan Street
CrossesRalston Creek
Location0.06 MI N of 58th Avenue
RouteCity Street 0
CountyJefferson County
StateColorado
Coordinates39.80305, -105.06923
Functional classUrban Local

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Culvert6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionApril 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry6: Equal to present minimum criteria
Waterway adequacy4: Meets minimum tolerable limits to be left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating31.7 US tons
Inventory rating19 US tons

Structure

Structure typeCulvert
MaterialSteel
DeckNot applicable
Main spans2
Design loadUnknown
Structure length24 ft (7.3 m)
Longest span11 ft (3.3 m)
Deck width59 ft (17.9 m)
Roadway width34 ft (10.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic576 (2021)
Projected traffic662 by 2041
Trucks2%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed98.8 mi (159 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCity or Municipal Highway Agency
Maintained byCity or Municipal Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedOther structural work, including hydraulic replacements
Estimated improvement cost$1 million (2017 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Nolan Street over Ralston Creek built?

It was built in 1950, making it 75 years old in 2025.

What condition is Nolan Street over Ralston Creek in?

The National Bridge Inventory rates it in fair condition. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound. The last reported inspection was in April 2023.

How much traffic does Nolan Street over Ralston Creek carry?

About 576 vehicles per day (2021 count), of which roughly 2% are trucks.

How long is Nolan Street over Ralston Creek?

The structure is 24 ft (7.3 m) long with a longest span of 11 ft (3.3 m) and a deck 59 ft wide.

Who owns Nolan Street over Ralston Creek?

It is owned by the City or Municipal Highway Agency.